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    Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 168fe32a
    Linus Torvalds 提交于
    Pull poll annotations from Al Viro:
     "This introduces a __bitwise type for POLL### bitmap, and propagates
      the annotations through the tree. Most of that stuff is as simple as
      'make ->poll() instances return __poll_t and do the same to local
      variables used to hold the future return value'.
    
      Some of the obvious brainos found in process are fixed (e.g. POLLIN
      misspelled as POLL_IN). At that point the amount of sparse warnings is
      low and most of them are for genuine bugs - e.g. ->poll() instance
      deciding to return -EINVAL instead of a bitmap. I hadn't touched those
      in this series - it's large enough as it is.
    
      Another problem it has caught was eventpoll() ABI mess; select.c and
      eventpoll.c assumed that corresponding POLL### and EPOLL### were
      equal. That's true for some, but not all of them - EPOLL### are
      arch-independent, but POLL### are not.
    
      The last commit in this series separates userland POLL### values from
      the (now arch-independent) kernel-side ones, converting between them
      in the few places where they are copied to/from userland. AFAICS, this
      is the least disruptive fix preserving poll(2) ABI and making epoll()
      work on all architectures.
    
      As it is, it's simply broken on sparc - try to give it EPOLLWRNORM and
      it will trigger only on what would've triggered EPOLLWRBAND on other
      architectures. EPOLLWRBAND and EPOLLRDHUP, OTOH, are never triggered
      at all on sparc. With this patch they should work consistently on all
      architectures"
    
    * 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (37 commits)
      make kernel-side POLL... arch-independent
      eventpoll: no need to mask the result of epi_item_poll() again
      eventpoll: constify struct epoll_event pointers
      debugging printk in sg_poll() uses %x to print POLL... bitmap
      annotate poll(2) guts
      9p: untangle ->poll() mess
      ->si_band gets POLL... bitmap stored into a user-visible long field
      ring_buffer_poll_wait() return value used as return value of ->poll()
      the rest of drivers/*: annotate ->poll() instances
      media: annotate ->poll() instances
      fs: annotate ->poll() instances
      ipc, kernel, mm: annotate ->poll() instances
      net: annotate ->poll() instances
      apparmor: annotate ->poll() instances
      tomoyo: annotate ->poll() instances
      sound: annotate ->poll() instances
      acpi: annotate ->poll() instances
      crypto: annotate ->poll() instances
      block: annotate ->poll() instances
      x86: annotate ->poll() instances
      ...
    168fe32a
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